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If you can afford the difference I would go with a topper. I have a oversized 3 dog box in the back of a 250 Super Duty and it is a real pain getting to the middle door. Also with a topper you still would have storage underneath where with a box you loose the whole bed.

The one thing i liked about this guys design of his crossover is that he can detach the upper 3 holes and only be left with a 2 hole dog box on the bottom. Just thought i'd add that bit of information in.